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+//Chapter-2, Example 2.3, Page 90

+//=============================================================================

+clc;

+clear;

+//INPUT DATA

+phi=0.1*10^-3;//flux in wb

+a=1.7*10^-4;//area of cross-section in m^2

+lg=0.5*10^-3;//length of air gap in m

+Rm=15/2;//radius of ring in cm

+u0=4*%pi*10^-7;//permeability in free space in henry/m

+N=1500;//no of turns of ring

+//CALCULATIONS 

+B=(phi/a);//flux density in wb/sq.m

+H=(B/(4*%pi*10^-7));//magnetic flux density in A/m

+ampere_turns_provided_fo=H*lg;

+total_ampere_turns_provi=N*1;

+Available_for_iron_path=N-(H*lg);

+length_of_iron_path=(2*Rm*%pi*10^-2)-(lg);//length of iron path in m

+H_for_iron_path=((N-(H*lg)))/(length_of_iron_path);

+ur=(B/(u0*H_for_iron_path));//relative permeability of iron

+//OUTPUT

+mprintf("Thus relative permeability of iron is %d",ur);

+ //=================================END OF PROGRAM==============================